[U-Boot] What if ATF can be part of U-Boot source, like SPL?

Tom Rini trini at konsulko.com
Sun Jun 30 13:57:03 UTC 2019

On Sat, Jun 29, 2019 at 08:32:00PM +0530, Jagan Teki wrote:

> In terms of code maintenance and development feasibility it is always
> a better approach to have out-of-tree code or binary to be part of
> in-house source tree.
> This is what exactly it was done for SPL, if I'm not wrong. So can we
> do the same thing for ATF on ARM64 SoCs?
> We are using ATF (on Allwinner) to switch EL3 to EL2 for start loading
> U-Boot proper and minimal PSCI, PMIC initialization. So assuming the
> functionality of ATF (like here) is limited so the code it require can
> be limited too, so why can't this code to be part of U-Boot tree?
> This would ultimately avoid out-off-tree ATF builds with associated
> variable exporting during u-boot builds.
> More over this idea would also help to design a single-step bootloader
> where it can't depends on out-of-tree sources.
> Code sync from ATF source to U-Boot can be possible in-terms licensing
> point-of-view since ATF licensed under BSD-3-Clause.
> I'm thinking this can be a worth-idea to look at it and I'm sure It
> may require some hard changes and other things to consider but just
> posted to understand how hard or feasible or meaningful it is?
> Feel free for any comments?

Given that we have "TPL" and "SPL", my "pie in the sky" wish would be
for the ability to build different U-Boots to fill the different aspects
of the aarch64 boot flow.

That said, patches that would in turn allow for users to locally add ATF
as a git submodule and then build that, if cleanly done, could be
interesting.  But must not impact the normal build flow.

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